NotificationAdjustmentExtractorTest: Mark unaudited PendingIntents with FLAG_MUTABLE_UNAUDITED

These PIs need an explicit mutability flag. This temporay flag is being
used to mark these points in code and should be replaced ASAP.
See go/immutable-pendingintents for more context.

Bug: 160794467
Test: TH
Exempt-From-Owner-Approval: noop change
Change-Id: Ie87153ca5c60df34a302175e6a02b49225f3599f

services/tests/uiservicestests/src/com/android/server/notification/NotificationAdjustmentExtractorTest.java

@@ -126,6 +126,7 @@ public class NotificationAdjustmentExtractorTest extends UiServiceTestCase {
         return new Notification.Action.Builder(
                 Icon.createWithResource(getContext(), android.R.drawable.sym_def_app_icon),
                 "action",
-                PendingIntent.getBroadcast(getContext(), 0, new Intent("Action"), 0)).build();
+                PendingIntent.getBroadcast(getContext(), 0, new Intent("Action"),
+                    PendingIntent.FLAG_MUTABLE_UNAUDITED)).build();
     }
 }